HCX plugin download failing in vCenter due to Error downloading plug-in. URL is unreachable. connect timed out

Products

• VMware HCX

Issue/Introduction

After editing and saving the vCenter Server Configuration on the HCX VAMI (port 9443 interface), there are tasks in vCenter showing 'Error downloading plug-in'.

After editing the above, you see the errors below.

Error downloading plug-in. URL is unreachable. connect timed out

Error downloading plug-in. Make sure that the URL is reachable and the registered thumbprint is correct.
URL: Name or service not known

The HCX plugin link is missing  from the vCenter navigation Menu.

The HCX UI is accessible from the standalone HCX UI https://hcxmanager

All HCX functionality is available and working from the standalone UI.

 

Environment

HCX 4.x

Cause

The HCX manager cannot communicate with vCenter on port 9443.

Resolution

Port 9443 is required for plug-in communication between HCX and vCenter.

Verify that HCX can reach vCenter on port 9443.

1. SSH to the HCX Manager as admin.

2. Run a curl command to check the port is reachable on vCenter.

curl -vk https://<vCenterIP>:9443

3. If it does not report a successful connection, consult your network team or firewall vendor to have the port allowed.

The required configuration is Source: HCX Manager IP, Destination: vCenter IP, Port 9443

Additional Information

VMware HCX Ports